ANGLE SENSOR TEMPERATURE CORRECTING DEVICE

摘要

An angle sensor temperature correcting device includes: a zero correcting factor storing portion that stores, as a reference temperature bridge midpoint potential difference offset and a bridge total resistance indicating value, a difference from an actual correct value, for a relative angle between a bridge circuit and a magnetic field, for the bridge midpoint potential difference, and a value indicating the total resistance of the bridge circuit, at a reference temperature, and stores, as a zero correcting factor, a ratio of the bridge midpoint potential difference offset and the bridge total resistance indicating value at the reference temperature; and a temperature correcting portion that performs temperature correction on angle information obtained from the bridge midpoint potential difference of the bridge circuit at a given time, based on a zero correcting factor stored in the zero correcting factor storing portion.

主权项

1. An angle sensor temperature correcting device, comprising:
a bridge circuit that includes four magnetoresistive elements, connected in a bridge connection, and receives a supply of a constant current across power supply terminals; a magnetic field generating portion that generates a magnetic field that acts on this bridge circuit, for performing temperature correction on angle information from an angle sensor that outputs a bridge midpoint potential difference for the bridge circuit as relative angle information between the bridge circuit and the magnetic field; a zero correcting factor storing portion that stores, at a reference temperature, as bridge midpoint potential difference offset a difference from an actual value to a correct value for a relative angle between the bridge circuit and the magnetic field of the bridge midpoint potential difference, and as a bridge total resistance indicating value a value indicating the total resistance of the bridge circuit at the reference temperature, and stores, as a zero correcting factor, a ratio of the bridge midpoint potential difference offset and the bridge total resistance indicating value at the reference temperature; and a temperature correcting portion that performs temperature correction on angle information obtained from the bridge midpoint potential difference of the bridge circuit at a given time, based on a zero correcting factor stored in the zero correcting factor storing portion.